Device for displaying maps



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Y A. DOM.

DEVICE FOR DISPLAYING MAPS, CHARTS, AND ILLUSTRATIONS.

No. 256 827. Patented Apr.25, 1882.

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(Model) A. 130M. DEVICE FOR DISPLAYING MAPS, CHARTS, AND ILLUSTRATIONS. No, 256,827.

Patented Apr. 25, 1882;.

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A. DOM. v DEVICE FOR DISPLAYING MAPS, CHARTS, AND ILLUSTRATIONS. No. 256,827. Patented Apr.25, 1882.

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UNITED STATES PATENT OFFICE.

ALEXANDER DOM, OF MOUNT HEALTHY, OHIO.

DEVICE FOR DISPLAYING MAPS, CHARTS, AND ILLUSTRATIONS.

SPECIFICATION forming part of Letters Patent No. 256,827, dated April 25, 1882. Application filed August 10,1ee1. tModel.)

To all whom it may concern:

Be it known that I, ALEXANDER DOM, of Mount Healthy, Hamilton county, Ohio, have invented certain new and useful Improvements in Devices for Displaying Maps, Charts, and Illustrations, of which the following is a specification.

For convenience of reference 1 will describe my device as applied to the display of maps; but it will be obvious that my invention is not limited in its usefulness to this particular use, but may be employed with equal advantage for displaying show-cards, or demonstrating, teaching, exhibiting, or showing any subject requiring a series of illustrations, whether by letters, words, lines or diagrams, drawings or pictures, 850.

The method now most commonly in vogue of providing oftices, schools, &c., with a number of single maps, each one to be displayed, requiring to be separately suspended from a suitable hanger, has caused a great deal of inconvenience; and the object of my invention is to remedy this inconvenience by providing meanswhereby an entire series of maps or illustrative sheets of any description may be suspended from one hanger in such a manner that any desired one of the series may be displayed at will.

The principal feature of my invention consists of a roller, which is caused to revolve by suitable mechanism, to which roller is connected, in a manner hereinafter mentioned, the seriesof maps or illustrations to be displayed;

The precise nature of my invention, whereby the above object is accomplished, will be evident from the drawings and the following description.

Figure 1 represents my device ready to be applied to the wall or any other suitable hanger. Figs. 2 and 3 represent various devices by which the maps are wound on theroller. Fig. dis an end view of the lower roller shown in Fig. 1, with several maps suspended therefrom. Fig. 5 represents a portion of the roller with the maps partially wound thereon. Fig. 6 represents the interior of the lower roller shown in Fig. 1, showing devices other than those shown in Figs. 2 and 3 for causing the maps to be wound on the roller. Fig. 7 is a longitudinal section through the roller 13, showing the interior spring.

A is the roller, which is journaled at either end in a suitable bracket, A. To this roller the maps a a a a are secured, preferably in the manner shown in Fig. 4, each map. being secured to the one immediately behind it; but these maps may each, if preferred, be attached directly to the roller; but in either event the map should be so arranged that the lower end of each map shall hang slightly below the one immediately behind, as shown in Fig. 4. The lower end of each map is provided with a metallic strip, B, which serves the double purpose ot'a bindingfor the edge of the map, keeping it in shape, and also acting as a weight to cause the'map to hang straight. In Fig. 5 the maps are represented as being rolled up on the roller, the lower end of the Indiana map being displayed. It, now, this map is to be displayed entire, the lower edge is grasped and pulleddown, when this map, and none other, will be visible; but if it is desired to display some other map of the series, the roller is turned in the direction indicated by the arrow on Fig. 5, which will cause the ends of the maps on the roller to alternately fall over and occupy the position of the Indiana map in said Fig. 5, and the roller is turned in this manner until the lower .end of the desired map is brought into view, when it is grasped and pulled down, as before described. In this manner any map on the roller may be exhibited at will.

Various devices may be employed for rolling the maps on the roller; but I preferably employ that form which isshown in Figs. 1, 4, 6, and 7,in which a spring-roller is employed. The roller A in such instance is hollow and contains a spring-roller, B of any suitable description-4n the present instance that-form of spring-roller known as the Hartshorn Roller. A shaft, b, extends entirely through the roller from end to end, and is supported at either end inthe brackets A. One end of this shaft is made square where it enters the bracket, as shown at b, to prevent it from turning, and the roller A and spring-roller B are free to turn on this shaft.

To one end of the springroller I attach .a ratchet-wheel, O, and to the interior of the too of the ratchet 0, in such a manner that when a map is pulled down, roller A being turned in the direction of the arrow in Fig. 6, the end of the pawl C will strike against one of the teeth of the ratchet O, causing the spring-roller B to revolve with the roller A, and in this manner the spring contained in the springroller is wound up when the map is pulled down.

The map is caused to remain unrolled by any appropriate device as long as it is desired to have itdispayed, when it is released, and the spring Z in the springroller B ,which was wound up by pulling the map down, causes the roller A to turn in a direction opposite to that indicated by the arrow, and thus the map is rolled on the roller A.

The construction of the ratchet O and pawl G issuch, as will be seem-that the roller A may be turned 'as much as desired in a direction opposite to that indicated by the arrow without turning the spring-roller B This or an equivalent device is necessary where a roller, as A, and a spring-roller, as B are employed, as the rollerA must be turned in this (l-iIBUtlOll-\lZ., opposite to that indicated by the arrow-in order that the lower ends of the various maps may be alternately brought into view, as before described. In connection with this roller A, I preferably employ a supplemental roller, D,which is placed over the roller A, and arranged tobear against the roller A and the maps or charts thereon. In the present instance this roller Dis supported at either end in a spring-bracket, d, the spring of which causes theroller D to bear with a snfficient degree-of tension on the roller A. This supplemental roller D may, however, be caused to bear upon the roller A by any preferred means other than the spring-brackets d--as, for instance, by weights, or by making the roller Dof a heavy material and employing its own weight to press down on the roller A. The purpose of this supplemental roller is to keep the maps or charts smooth on the roller A and prevent them from buckling as they are unrolled from the roller A. While this supplemental'roller is of great advantage in the working of my invention, it may, however, be dispensed with and the strip or binding B be made sufficiently heavy to hold the maps smooth on the roller A.

Other devices than those already described may be employed for rolling the maps or charts on the roller -as, for instance, those shown in Figs. 2 and 3. In Fig. 2 the ordinary curtaincord and an appropriate tension-pulley, E, is employed. In Fig. 3 the cord and pulley are dispensed with and crank F substituted therefor, the crank being attached directly to the roller A. In either of the latter-described devices the roller A may be solid and be made of any desired substance.

What I claim as new and of my invention, and desire to secure by Letters Patent, is-

1. The combination of the roller A and two or more sheets of maps, display-cards, charts, or illustrations hung thereon, the sheet being so arranged that the lower end of each sheet is below the one immediately behind it, and the roller B located within the main roller A, and actuated byaspring for rotating the main roller and winding up the sheets,snbstantially as and for the purposes specified.

2. The combination of the roller A and two or more sheets of maps, display-cards, charts, or illustrations hung thereon, the sheets being so arranged that the lower end of each sheet is below the one immediately behind it, anda roller, B located within the main roller A, and actuated by a spring for rotating the main roller and winding up the sheets, and the-pawl O and ratchet O, substantially as and for the purposes specified.

3. The combination of the roller A and two or more sheetsot maps, display-cards, charts, or illustrations hung thereon, the sheets being so arranged that the lower end of each sheet is below the one immediately behind it, and a roller, Bfllocated within the roller A, and actuated by a spring for rotating the main roller, and auxiliary roller D, substantially as and for the purposes specified.

4. The combination of roller A and two or more sheets of maps, display-cards, charts, or illustrations hung thereon, the sheets being so arranged that the lower end of each sheet shall hang below the one immediately behind it, and the roller B located within the roller A, and actuated by a spring for rotating the main roller, and auxiliary roller D,and pawl 0 and ratchet G, substantially as and for the purposes specified.

5. The combination of the roller A, provided with spring-pawl O,'and interior springroller, B provided with ratchet C, said rollers rotating on shaft 0, provided with square extremity b, to prevent the shaft from turning in the brackets or supports A, and the sheets of maps, charts, display-cards, or illustrations a a a aflsubstantiallyas and for the purposes specified.

6. The combination of the roller A, provided with spring-pawl G, and interior springroller, B provided with ratchet C, said rollers rotating on shaft 1), provided with square ex- IIO tremity b,to prevent the shaft from turning in the brackets A, and the sheets of maps, charts, display-cards, or illustrations a a. a a attached to roller A, and supplemental roller D, caused to bear against the roller A by the spring d,substantially as and for the purposes specified.

7. The combination of the rollerA and two or more sheets of maps, charts, display-cards, or illustrations suspended therefrom, each sheet being attached to the one immediately behind it, the last one being suspended from the roller,

the sheets being so arranged that the lower with mechanism for compellingthe outer roller end of each one is below the one immediately behind it, substantially as and for the purposes specified.

8. The combination of the rollers A and B and two or more sheets of maps, charts, dis- 1 o mediately behind it, the rollers being provided to move with the inner roller in one direction and permitting the outer roller to rotate in the opposite direction, independently of the inner roller, substantially as and for the purposes 15 specified.

ALEXANDER DOM. Witnesses:

GEORGE A. HOWARD, E. R. HILL. 

